ISColoringType#

determines if the coloring is for the entire parallel grid/graph/matrix or for just the local ghosted portion

Synopsis#

#include "petscis.h" 
typedef enum {
  IS_COLORING_GLOBAL,
  IS_COLORING_LOCAL
} ISColoringType;

`IS_COLORING_GLOBAL` - does not include the colors for ghost points, this is used when the function

is called synchronously in parallel. This requires generating a "parallel coloring".

`IS_COLORING_LOCAL` - includes colors for ghost points, this is used when the function can be called

separately on individual processes with the ghost points already filled in. Does not

require a "parallel coloring", rather each process colors its local + ghost part.

Using this can result in much less parallel communication. Currently only works

with DMDA and if you call MatFDColoringSetFunction() with the local function.

beginner